Is there any need to use External ADC for PIC16F877A

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vinoth

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Hi,
I'm new to pic controller. I connected -Vref at port A.2 and +Vref at port A.3 and Analog input at Port A.5. Then the out put will be store where. Thanks in advance.
 
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vinoth said:
Hi,
I'm new to pic controller. I connected -Vref at port A.2 and +Vref at port A.3 and Analog input at Port A.5. Then the out put will be store where. Thanks in advance.
Click to expand...

hi,

If you are OK with 10 bit resolution, there is no need for an external A2D convertor with a 16F877A.

What is the volatge you want to convert.? volts etc...
 
vinoth said:
Hi,
Thanks for your suggestion. In my application I need a 8 bit resolution.
Click to expand...

In which case you are perfectly fine with the 16F877A, it can be easily configured to allow simple 8 bit readings.

My tutorials explain how to use the analogue inputs.
 
vinoth said:
Hi,
I'm new to pic controller. I connected -Vref at port A.2 and +Vref at port A.3 and Analog input at Port A.5. Then the out put will be store where. Thanks in advance.
Click to expand...

hi,
What voltage are you trying to convert.?
The description of the -/+Vref is puzzling.
 
vinoth said:
-Vref=-2v and +Vref=6v
Click to expand...

You can't have a negative Vref, 0V is as low as you can go, you also can't go above Vdd (usually 5V).

This is pretty universal with all ADC's.

DC shift the signal so it fits within the permitted limits.
 
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